JPH0639445Y2 - Insulator-supported current transformer - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a current transformer used for detecting a current in an electric line, and in particular, a current transformer main body is supported on a support insulator. The present invention relates to an insulator-supported current transformer.

[Prior Art] In a conventional insulator-supported current transformer of this type, the current transformer main body mounted on the support insulator is divided into two parts, and the current transformer main body holds the insulation-coated electric wire. It was fixed by tightening with fasteners.

[Problems to be solved by the invention] However, in this conventional configuration, since the insulated coated electric wire is directly gripped between the current transformer main bodies of the two-divided configuration, the insulated coated electric wire is shaken by the wind pressure load. When moving, the impact load is directly transmitted to the current transformer body, which may lead to deterioration of the current transformer body or damage to the watertight structure of the current transformer body, making it easier for rainwater to enter inside. Since the electric wire gripping force is small, it is necessary to install an electric wire support insulator separately from the current transformer.

The present invention was made by paying attention to the problems existing in such a conventional technique, and the purpose thereof is that even if the insulated coated electric wire is shaken by a wind pressure load, the current is changed. The main body of the insulator does not deteriorate due to strong impact, the watertight structure of the main body of the current transformer is damaged, rainwater, etc. does not easily enter the inside, and the insulator support type with sufficient wire gripping force. It is to provide a sink.

[Means for Solving the Problems] In order to achieve the above object, a storage case for a main body of a current transformer is attached to an upper portion of an insulator supporting insulator of the present invention, and an insulation-coated electric wire is attached to the main body of the current transformer. In the insulator-supported current transformer, the storage case is provided with protrusions provided with engaging portions at opening portions on both sides thereof, and the electric wire gripper is provided with a two-divided electric wire holder provided with the engaging portions. The insulated wire is clamped and fixed to the protrusion of the case through an engaging portion of a two-divided insulating spacer loosely fitted to the wire.

[Operation] According to the insulator-supported current transformer configured as described above, the wire gripping tool that grips the insulated coated wire on both sides of the housing case that covers the main body of the current transformer has the protrusions provided on both sides of the housing case. Since the insulated covered electric wire is gripped and fixed to the portion via the insulating spacer at a position away from the opening of the housing case, even if the electric wire is shaken by wind pressure load,
The swinging force is transmitted to the housing case after being damped via the insulating spacer and the protrusion. Therefore, a strong shock is not directly transmitted to the current transformer body in the housing case,
It is possible to reliably prevent the possibility that the main body of the current transformer will deteriorate and the watertight structure of the main body of the current transformer will be damaged, making it easier for rainwater, etc. to enter the interior. It is possible to prevent bending deformation.

[Embodiment] An embodiment of an insulator-supported current transformer embodying the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 2, a support insulator 2 is mounted on a pole 1 of a utility pole and a bolt 4 and a nut 5 are attached to a mounting flange 3 at a lower end thereof.
It is fixed by. A current transformer body 6 is mounted on the upper end of the support insulator 2, and a housing case 7 made of an insulating material is molded on the outer periphery of the current transformer body 6. The current transformer body 6 and the housing case 7 are vertically divided into two parts, which are assembled and fixed to each other with a bolt 9 and a nut 10 in a state in which the insulation-coated electric wire 8 is inserted.

A resistor 11 and a sensor 12 using an electro-optical element are housed in the support insulator 2 and are electrically connected to the current transformer body 6. Then, when a current flows through the insulation-coated electric wire 8, a measurement current is induced from the current transformer body 6 in accordance with the current, and the measurement current is converted into a light intensity signal by the resistor 11 and the sensor 12 to generate a light intensity signal. It is designed to be output to the outside via the fiber cable 13.

Next, insulation-coated electric wires 8 on both sides of the current transformer body 6
The gripping structure will be described. As shown in FIGS. 1 to 3, cylindrical protrusions 14 serving as opening portions of the case 7 are formed on both sides of the housing case 7, and the outer periphery of the tip end thereof is engaged. A flange portion 14a as a portion is provided. An insulating spacer 15 which is divided into two parts on the right and left sides is loosely fitted to the insulating covered electric wire 8 with a gap therebetween, and each projection 14 has an inner periphery serving as an engaging part with the flange part 14a. Inner annular groove 15a
And an outer annular groove 15b is formed on the outer periphery.

On both sides of the housing case 7, an electric wire gripping tool 16 which is vertically divided into two parts is fitted around the outer periphery of the insulating coated electric wire 8 and the insulating spacer 15, and a pair of bolts 17 and nuts.
It is tightened and fixed by 18. On the inner peripheral surface of the wire gripping tool 16, a plurality of anti-slip blades 16a that bite into the outer peripheral surface of the insulation-coated electric wire 8 and a ridge 16b as an engaging portion with the outer annular groove 15b of the insulating spacer 15 are formed. Has been done.

Next, the structure for pulling out the optical fiber cable 13 will be described. As shown in FIG.
Is fitted to the lower end portion of the support insulator 2 through a packing 19,
It is fixed by the filler 21. A support cylinder 22 is screwed onto the mounting flange 3 via a packing 20, and a taper surface 22a is formed on the inner peripheral surface thereof. Fiber optic cable 1
A wedge member 23 made of an elastic material such as rubber, which is divided into two parts, is fitted to 3 and a taper surface 23a that engages with the taper surface 22a of the support cylinder 22 is formed on the outer peripheral surface thereof. There is.
A tightening member 24 is screwed into the lower portion of the support cylinder 22 via a packing 25, and by tightening the tightening member 24,
The wedge member 23 is moved upward and is brought into close contact with it under the wedge action based on the engagement of the two tapered surfaces 22a, 23a, so that the optical fiber cable 13 is fixedly held by the support cylinder 22.

Next, the operation of the insulator-supported current transformer configured as described above will be described.

Now, when a current flows through the insulation-coated electric wire 8, the current is measured by the current transformer main body 6, and the measured current is induced from the current transformer main body 6. This measurement current is applied to the resistor 11 in the support insulator 2, converted into a voltage, converted into a light intensity signal by the sensor 12, and output in this state to the outside via the optical fiber cable 13.

Now, in this embodiment, the wire grippers 16 for gripping the insulation-coated wires 8 on both sides of the housing case 7 covering the current transformer body 6 as described above are attached to the protrusions 14 provided on both sides of the housing case 7. On the other hand, the insulation-coated electric wires 8 are clamped and fixed via the insulating spacers 15 loosely fitted to the insulation-coated electric wires 8 to hold the insulation-covered electric wires 8 at positions apart from the opening of the storage case 7. Even when the insulation-coated electric wire 8 is rocked by a wind pressure load, the rocking force is generated by the wire gripping tool 16
Is transmitted to the housing case 7 through the insulating spacer 15 and the protrusion 14. Therefore, the impact load is not directly transmitted to the current transformer main body 6 in the housing case 7, and the current transformer main body 6 may be deteriorated or the watertight structure of the current transformer main body 6 may be damaged and It is possible to reliably prevent the possibility that rainwater or the like will easily enter.

Particularly, in the vicinity of the opening of the housing case 7, since the insulating spacer 15 is loosely fitted to the insulating covered electric wire 8, the vibration load due to the insulating covered electric wire 8 is transmitted to the projecting portion 14 of the housing case at this loose fitting portion. As a result, the vibration load into the storage case 7 is reduced, the load on the current transformer main body 6 is reduced, and the bending deformation of the insulation-coated electric wire at the opening of the storage case 7 is reduced to reduce the insulation-coated electric wire 8. The electric wire 8 is protected without being damaged.

[Effect of the Invention] Since the present invention is configured as described above,
Even if the wire swings due to wind pressure load, the swinging force is not reduced at the opening of the storage case and is not directly transmitted to the current transformer body, and the current transformer body receives a strong impact and deteriorates. Or the watertight structure of the current transformer body is damaged,
It is possible to reliably prevent the possibility that rainwater or the like may easily enter the inside, and further it is possible to protect the electric wire.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an electric wire grip portion of an insulator-supported current transformer embodying the present invention, FIG. 2 is a front view showing the entire insulator-supported current transformer, and FIG. 3 is FIG. 4 is a sectional view taken along the line AA, and FIG. 4 is a partial sectional view showing the structure for pulling out the optical fiber cable from the lower end portion of the support insulator. 2 ... Support insulator, 6 ... Current transformer body, 7 ... Housing case, 8 ... Insulated wire, 14 ... Projection, 15 ... Insulation spacer, 16 ... Wire gripping tool.

Claims (1)

[Scope of utility model registration request] 1. A current transformer body (6) on the upper portion of the support insulator (2).
In the insulator-supported current transformer in which the storage case (7) of (1) is mounted, and the insulated coated electric wire (8) is inserted into the main body (6) of the current transformer, the storage case (7) includes , A protrusion (14) having an engaging portion (14a) is provided at the opening on both sides, and a two-divided wire gripping tool (16) having an engaging portion (16b) forms a gap with respect to the electric wire. It is characterized in that the insulated wire (8) is fastened and fixed to the protrusion (14) of the case through the engaging portions (15a, 15b) of the two-divided insulating spacer (15) provided and loosely fitted. Insulator-supported current transformer.